ci(faustwp): wrap release zips in a faustwp/ top-level directory (#2438)

Both zip steps in the release-plugin composite action ran
`cd dist/faustwp && zip -r ../../foo.zip .`, which zipped the
contents of the slug directory instead of the directory itself.
Manual installs and downloads from GitHub Releases extracted as
loose files in the current directory instead of into faustwp/.

Zip from the parent dist/ instead, passing the slug as the
directory to recurse into, so faustwp/ becomes the archive's
top-level entry. SVN deploys via 10up's action are unaffected
because they consume the dist/faustwp directory directly.

Author: josephfusco

.github/actions/release-plugin/action.yml

@@ -46,8 +46,8 @@ runs:
         rsync -av --exclude-from="${{ env.PLUGIN_DIR }}/.distignore" ${{ env.PLUGIN_DIR }}/ dist/${{ env.SLUG }}
 
         zip_file="faustwp.${{ env.VERSION }}.zip"
-        cd "dist/${{ env.SLUG }}"
-        zip -r "../../$zip_file" .
+        cd "dist"
+        zip -r "../$zip_file" "${{ env.SLUG }}"
         cd -
 
         echo "zip-path=$PWD/$zip_file" >> $GITHUB_ENV
@@ -68,8 +68,8 @@ runs:
         sed -i -e '/\* Update URI: false/d' "dist/${{ env.SLUG }}/faustwp.php"
 
         org_zip_file="faustwp.${{ env.VERSION }}.org.zip"
-        cd "dist/${{ env.SLUG }}"
-        zip -r "../../$org_zip_file" .
+        cd "dist"
+        zip -r "../$org_zip_file" "${{ env.SLUG }}"
         cd -
 
         echo "org-zip-path=$PWD/$org_zip_file" >> $GITHUB_ENV